Detection of the incommensurate modulation of the hydrogen-bond double-minimum potential in the antiferroelectric phase of NH4HSeO4 |
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| Authors: | IP Aleksandrova OV Rosanov AA Sukhovsky YuN Moskvich |
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| Institution: | L.V. Kirensky Institute of Physics, Krasnoyarsk, 660036, USSR |
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| Abstract: | An incommensurate antiferroelectric phase in the NH4HSeO4 crystal was found by 77Se high-resolution NMR in the temperature range 250–262 K. An anomalous line-shape continuum limited by two-edge singularities is observed in this region and described by plane-wave modulation. A model where the asymmetry of proton occupation in the H-bond system is modulated along a certain direction is discussed. The incommensurate structure is metastable. |
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